A bit more background information would be helpful. For instance, how long have you been married, how long SSM, etc. It sounds to me like he very much wants to discuss the SSM thing, but doesn't know how to approach the subject diplomatically. He very likely has no idea how to verbalize what he's feeling, aside from "hey, I'm starving here!" I know that was my case. Until I read SSM, I "knew" all that stuff (i.e. how it wasn't just SEX I was longing for, but also the closeness and LOVE ). I think it's fantastic that you're reading this book, it says great things about your chances for creating a happier marriage for the two of you! I really would suggest you share the book with him right away.. perhaps get a second copy of it. If you both read it together (separately, but together), it should open up whole evenings of meaningful discussion between the two of you. He will be very grateful, and it might be a real life-saver in your R.
